1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
 
1940
1941
1942
1943
1944
January
February
March
April
May
June
July
August
September
October
November
December


1945
1946
1947
1948
1949
 
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
 
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
 
"Determination of Number of Unexcited Electron Structures for Porphyrins." Page 1. June 4, 1944
"Determination of Number of Unexcited Electron Structures for Porphyrins." June 4, 1944. Page 1  Larger Images / More Information. 3 pp.

Activity Listings

  • Letter from A. N. Richards, Committee on Medical Research, to LP. RE: Informs him that a contract with the Institute will be required before the chemical information he will need will be transmitted to him. [Filed under LP Science: Assorted LP War Work, 1940-1946: Box #13.006 Folder #6.1]